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🛡️ CVE-2026-42256 on BellSoft — ruby-net-imap

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Distribution advisory

This page covers CVE-2026-42256 as tracked by BellSoft, for the package ruby-net-imap. The fix is available in version 0.5.14-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

BELL-CVE-2026-42256 is classified as CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context. The product uses a non-blocking model that relies on a single threaded process for features such as scalability, but it contains code that can block when it is invoked.

Affected software

BELL-CVE-2026-42256 is recorded against 1 package.

  • ruby-net-imap (from 0.4.8-r0 up to 0.5.14-r0)

Timeline and source

Published on 16 May 2026 and last revised on 22 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

docs.bell-sw.com (Advisory)

Other advisories for this package

ruby-net-imap has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context) in other software:

CVE-2026-42256 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-16
Updated 2026-08-20
Modified 2026-05-22
Fix URL N/A

Affected Packages

Software From version Fixed in
ruby-net-imap 0.4.8-r0 0.5.14-r0

Vulnerability Monitoring

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